How severe is CVE-2018-8440?

CVE-2018-8440 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-8440 being actively exploited?

Yes. CVE-2018-8440 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-28, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-8440?

CVE-2018-8440 primarily affects Microsoft Windows 10 1607. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-8440?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-8440 have an EU (EUVD) identifier?

Yes. CVE-2018-8440 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-20076. It is also flagged as exploited in the EUVD (since 2022-03-28).

When was CVE-2018-8440 published?

CVE-2018-8440 was published on 2018-09-13 and last updated on 2026-06-17.

CVE-2018-8440

CVE-2018-8440 is a high-severity vulnerability in Microsoft Windows 10 1607 with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-28).

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 18% (97th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-03-28)
EU (EUVD) id: EUVD-2018-20076
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-28)
Affected product: Microsoft Windows 10 1607
Published: 2018-09-13
Last modified: 2026-06-17

Description

An elevation of privilege vulnerability exists when Windows improperly handles calls to Advanced Local Procedure Call (ALPC), aka "Windows ALPC Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

Frequently asked questions

What is CVE-2018-8440?: An elevation of privilege vulnerability exists when Windows improperly handles calls to Advanced Local Procedure Call (ALPC), aka "Windows ALPC Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.
How severe is CVE-2018-8440?: CVE-2018-8440 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-8440 being actively exploited?: Yes. CVE-2018-8440 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-28, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-8440?: CVE-2018-8440 primarily affects Microsoft Windows 10 1607. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-8440?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-8440 have an EU (EUVD) identifier?: Yes. CVE-2018-8440 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-20076. It is also flagged as exploited in the EUVD (since 2022-03-28).
When was CVE-2018-8440 published?: CVE-2018-8440 was published on 2018-09-13 and last updated on 2026-06-17.

References

Affected products (12)

cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1703:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*

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